KR101864884B1 - Method of operating charge door of furnace - Google Patents

Method of operating charge door of furnace Download PDF

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Publication number
KR101864884B1
KR101864884B1 KR1020160175457A KR20160175457A KR101864884B1 KR 101864884 B1 KR101864884 B1 KR 101864884B1 KR 1020160175457 A KR1020160175457 A KR 1020160175457A KR 20160175457 A KR20160175457 A KR 20160175457A KR 101864884 B1 KR101864884 B1 KR 101864884B1
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KR
South Korea
Prior art keywords
heating furnace
loading door
working beam
door
distance value
Prior art date
Application number
KR1020160175457A
Other languages
Korean (ko)
Inventor
전재현
Original Assignee
주식회사 포스코
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Priority to KR1020160175457A priority Critical patent/KR101864884B1/en
Application granted granted Critical
Publication of KR101864884B1 publication Critical patent/KR101864884B1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • C21D9/0018—Details, accessories not peculiar to any of the following furnaces for charging, discharging or manipulation of charge
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0056—Furnaces through which the charge is moved in a horizontal straight path
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/22—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace on rails, e.g. under the action of scrapers or pushers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/38—Arrangements of devices for charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/39—Arrangements of devices for discharging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/40—Arrangements of controlling or monitoring devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1858—Doors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/04—Ram or pusher apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/38—Arrangements of devices for charging
    • F27B2009/382—Charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/38—Arrangements of devices for charging
    • F27B2009/384—Discharging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D2003/0085—Movement of the container or support of the charge in the furnace or in the charging facilities
    • F27D2003/0091—Horizontally
    • F27D2003/0092—Horizontally with a reciprocating movement

Abstract

A method of operating a heating furnace loading door is disclosed. The heating furnace loading door operation method according to an embodiment of the present invention is a method of operating a heating furnace loading door in a heating furnace during a working beam operation in which a work placed in the heating furnace is transferred into a heating furnace by repeatedly raising, advancing, In the case where there is no material at the entrance end of the running beam in the running operation of the loading door, the opening amount of the loading door is reduced to a value smaller than that in the case where there is a material at the entrance end.

Description

METHOD OF OPERATING CHARGE DOOR OF FURNACE [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of operating a heating-furnace door, and more particularly, to a heating-furnace door operating method capable of minimizing heat loss in a heating furnace.

Generally, a material to be charged into a heating furnace is loaded on a walking beam, and then is transported to the inside of the heating furnace through a process of rising, advancing, descending, and reversing the working beam.

During the rising of the working beam on which the material is loaded, a charging door (charge door) for opening and closing a charging port formed on one side of the heating furnace also rises at the same time, The heat of the heating furnace flows out to the outside because it remains open.

In this case, when the working beam is automatically operated, the loading door is unfailingly opened regardless of the presence of material on the entry end of the heating furnace. Therefore, in the case where there is no material on the entry end, unnecessary full opening of the loading door causes a great heat loss Lt; / RTI >

Korean Patent Publication No. 10-2016-0023133 (published on March 23, 2016)

An embodiment of the present invention is to provide a heating furnace door operating method capable of more effectively minimizing heat loss wasted in a heating furnace.

According to an aspect of the present invention, the heating beam is moved upward, forward, downward, and backward by repeating the operation of moving the work beam to the inside of the heating furnace, A method of operating a loading door, comprising the steps of: opening the loading door by opening the loading door to reduce the opening amount of the loading door when a material is present in the loading door, Comparing a distance value obtained by adding a forward distance value of the working beam to a charging distance value obtained by summing a forward distance of the pusher and a width of the material to move the material, and comparing the summed distance value with a predetermined value, And if it is smaller than a preset value, it is determined that the material is not present at the long-mouth end.

delete

Further, the opening amount of the charging door may be a value corresponding to a height not to collide with the charging door when the working beam rises and advances when there is no material on the charging entrance.

According to another embodiment of the present invention, when the working beam is moved to the inside of the heating furnace by repeating the operation of raising, advancing, lowering and reversing the working beam, the inlet of the heating furnace is opened Wherein the loading door is fully opened when the working beam is lifted and the material is fed to the inlet end of the heating furnace at the rising end of the heating furnace, The loading distance value obtained by adding the forward distance of the pusher and the width of the workpiece to the forward distance value of the working beam and the preset distance value And if it is determined that the sum of the distance values is less than the preset value, it is determined that the material is not present at the long- It can gongdoel.

delete

The embodiment of the present invention minimizes the heat loss that is wasted due to the minimum opening of the loading door when the material is moved by the working beam from the heating furnace entrance to the extraction end, thereby causing poor quality of the product heating quality due to temperature deviation due to penetration of outside air when the loading door is completely opened Can be reduced.

According to the embodiment of the present invention, it is possible to minimize waste of energy by minimizing the heat loss of the heating furnace by minimizing the loading door when there is no material by judging the presence of material on the heating furnace entrance.

1 is a configuration diagram of a heating furnace to which a heating furnace loading door operating method according to an embodiment of the present invention is applied.
2 is a view for explaining that a charging door of a heating furnace to which a heating furnace charging door operating method according to an embodiment of the present invention is applied is fully opened.
3 is a view for explaining that a charging door of a heating furnace to which a heating furnace charging door operating method according to an embodiment of the present invention is applied is opened to the minimum.
4 is a control flowchart of a method of operating a heating furnace loading door according to an embodiment of the present invention.
5 is a control flowchart of a method of operating a heating furnace loading door according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments to be described below are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the width, length, thickness, etc. of components are exaggerated for the sake of convenience. Like reference numerals designate like elements throughout the specification.

1 is a configuration diagram of a heating furnace to which a heating furnace loading door operating method according to an embodiment of the present invention is applied.

Referring to FIG. 1, the furnace 20 is provided outside the heating furnace 10. The inside of the heating furnace 10 is divided into heating zones in accordance with cracks in the first heating zone, the second heating zone, the third heating zone, and the extraction stage.

On one side of the heating furnace (10), a sheet inlet (11) is formed as an inlet for charging the material (20) into the heating furnace (10). A loading door 12 is provided in the entry opening 11.

A motor 13 is provided on the upper part of the heating furnace 10. A wire (14) is connected between the motor (13) and the loading door (12).

When the motor 20 installed in the heating furnace 10 is rotated, the motor 14 installed on the upper portion of the heating furnace 10 is rotated in one direction so that the wire 14 wound on the pulley 15 is pulled, The loading door 12 connected to the loading door 12 is moved upward and the entry opening 11 is opened. When the motor 20 is not charged, when the motor M is rotated in the opposite direction, the wire 14 wound on the pulley 15 is released and the loading door 12 connected to the wire 14 moves downward The entry opening 11 is closed. Hereinafter, the operation of opening the entry port 11 is described as closing the loading port 12 by closing the entry port 11 by opening the loading port 12 for convenience of explanation.

A conveying device such as a working beam 30 capable of moving the workpiece 20 is provided inside and outside the heating furnace 10.

The working beam (30) moves the material placed on the entry end of the heating furnace (10) into the heating furnace. The working beam 30 moves the heated material to the extraction end in the heating furnace 10 so that the heated material can be discharged to the outside of the heating furnace 10 while heating the workpiece 20 in the heating furnace 10 . At this time, the long-mouth end refers to the leading end of the corresponding walking beam 30, and the extraction end refers to the extraction end of the corresponding walking beam 30.

The working beam 30 is formed so as to extend from the longitudinal end of the heating furnace 10 to the extraction end. That is, a part of the working beam 30 is provided outside the heating furnace 10 and the rest is provided inside the heating furnace 10.

When the work 20 is transferred to the working beam 30 at a position corresponding to the length of the furnace 10, the working beam 30 loads the work 20 into the furnace 10.

The working beam 30 is conveyed to the inside of the heating furnace 10 by repeating a rectangular reciprocating motion such as upward, forward, downward, and backward movement.

There is provided a pusher 40 capable of transporting the workpiece 20 away from the loading door 12. [ The pusher 40 is a device for pushing the workpiece 20 and feeding the workpiece 20 to the long-mouth end of the working beam 30 corresponding to the long-mouth end of the heating furnace 10.

The pusher 40 advances to approach the inlet port 11 or backward to be away from the inlet port 11. [ The pusher 40 can feed the work 20 while performing a linear movement (movement in the x-axis direction in Fig. 1) in one direction. The advance time and advance distance of the pusher 40 may be set in advance.

The pusher 40 operates according to a preset advance time and an advance distance to feed the work 20 to the long-mouth end of the working beam 30.

The pusher 40 pushes the material 20 placed on the inlet table 50 while advancing and feeds the material 20 to the long-mouth end of the working beam 30.

The material 20 can be manufactured in various widths (length in the x-axis direction in Fig. 1). The advance distance of the pusher 40 can be determined based on the maximum width of the work 20. The sum of the advancing distance of the pusher 40 and the width of the workpiece 20 to prevent collision between the workpiece 20 and the loading door 12 is equal to the sum of the distance between the position of the loading door 12 and the initial position of the pusher 40 May be less than the distance.

The sum of the advancing distance of the pusher 40 and the width of the work 20 may be less than the distance value of the length of the heating furnace 10.

The control unit 60 drives a working beam driving unit for driving the working beam 30 to control a series of working beam operations for raising, advancing, lowering, and reversing the working beam 30.

The control unit 60 controls the pusher operation to advance and retreat the pusher 40 by driving the pusher drive unit for driving the pusher 40. [

The control unit 60 operates the motor 13 to open or close the loading door 12. [

The control unit 60 can determine whether or not there is a material in the long-mouth part.

The control unit 60 can determine the presence or absence of a material at the leading and trailing ends by using the distance at which the pusher 40 advances, the width of the material 20, the short-throw distance, and the advancing distance of the working beam 30.

On the other hand, the controller 60 may determine whether or not there is a material 20 in the mouth and mouth using a material detecting sensor for detecting the presence or absence of a material at the long mouth.

FIG. 2 is a view for explaining that a charging door of a heating furnace to which a heating furnace charging door operating method according to an embodiment of the present invention is applied is fully opened. Fig. 3 is a view for explaining that the loading door of the heating furnace to which the door operating method is applied is at least opened.

2 and 3, the opening amount of the loading door 12 is preset in accordance with the presence or absence of a material at the long-side end of the heating furnace 10 during the automatic operation of the continuous running beam.

When the raw material 20 is present at the long-term end of the heating furnace 10, the loading door 12 is fully opened (see Fig. 2).

If the material 20 does not exist on the long-side end of the heating furnace 10, the loading door 12 is opened to the minimum (see FIG. 3). The opening amount of the minimum opening may be a height that does not collide with the loading door 12 when the working beam 30 is advanced and moved forward. For example, when the rising height of the working beam 30 is 90 mm, the opening amount at the minimum opening may be a height at which the safety margin is applied to 90 mm.

Therefore, by controlling the amount of opening of the loading door 12 differently depending on the presence or absence of a material at the long edge of the heating furnace 10, the loading door 12 can be opened It is possible to minimize the heat loss of the heating furnace 10 and to minimize the energy waste.

When the material 20 is moved by the pusher 40 to the long mouth, the control unit 60 controls the charging distance (the distance (the sum of the forward pushing distance and the material width advancing for transporting the material to the long- And the forward distance traveled by the working beam 30 when the working beam 30 moves the workpiece 20 to the extraction end is added to the stored charging distance so that the sum of the sum of the forward distance traveled by the workpiece 20 Of the material 20 to the first heating zone in the heating furnace is satisfied and the next material 20 is not charged by the pusher 40 until that time, Thereby opening the loading door 12 to the minimum.

The control unit 60 compares the distance value obtained by adding the working beam advancing distance and the charging distance to the charging short distance value and if the summed distance value is larger than the charging short distance value, , It can be judged that the material 20 does not exist in the long-mouth end if the summed distance value is smaller than the charging short-distance value.

When the work 20 is not located on the long-term end of the heating furnace 10, when the work beam 30 is moved upward during the work movement operation by the automatic operation of the working beam, the loading door 12 is not completely opened The heat loss in the heating furnace can be minimized by minimizing the opening of the charging door 12 to a position where the charging door 12 does not collide, and it is possible to reduce the occurrence of quality defects due to external air infiltration.

4 is a control flowchart of a method of operating a heating furnace loading door according to an embodiment of the present invention.

Referring to FIG. 4, the controller 60 senses whether the material 20 is present at the long-mouth part (100). At this time, the controller 60 determines that there is a material 20 on the leading edge of the leading edge if the distance value obtained by comparing the distance value obtained by adding the charging distance to the working beam advancing distance and the charging short distance value is larger than the charging short- If a distance value is less than the charging short distance value, it can be judged that there is no material 20 on the long-term end.

The control unit 60 determines whether there is a material 20 in the long and short edges according to the result of the sensing in the operation mode 100 (102).

If there is a workpiece 20 at the entry end of the operation mode 102, the controller 60 opens the loading door 12 completely (104) when the working beam rises during the working beam operation. When the working beam is lowered during the working beam operation, the loading door 12 is closed (106).

On the other hand, if it is determined in operation mode 102 that there is no blank 20 at the entrance, the controller 60 opens the loading door 12 to the minimum at the rising of the working beam during the working beam operation (108). The heat loss inside the heating furnace can be reduced without colliding with the loading door 12 when the working beam 30 rises and advances as the loading door 12 is opened to the minimum. Then, the loading door 12 is closed (110) when the working beam is lowered.

5 is a control flowchart of a method of operating a heating furnace loading door according to another embodiment of the present invention.

Referring to FIG. 5, the controller 60 first operates the working beam 30 (200).

The control unit 60 fully opens the loading door 12 when the working beam rises (202).

Then, the control unit 60 calculates a distance value A obtained by adding the working beam advance distance and the charging distance (pusher advance distance and work width) (204).

The control unit 60 compares the summed distance value A calculated in the operation mode 204 with a preset value to determine whether the summed distance value A is less than a preset value (206). The predetermined value may be the length of the heating furnace 10 or the length of the heating beam 10 corresponding to the length of the heating furnace 10.

If the summed distance value A is equal to or greater than the preset value, the control unit 60 maintains the loading door 12 fully opened (208).

On the other hand, if it is determined in operation mode 206 that the summed distance value A is less than the preset value, the controller 60 switches 210 to the minimum opening with the amount of opening reduced compared to when the loading door 12 is fully opened. As a result, heat loss in the heating furnace can be minimized and quality defects due to external air infiltration can be reduced.

10: heating furnace 11:
12: Loading door 20: Material
30: Working beam 40: Pusher
50: Input table 60:

Claims (5)

A method for operating a loading door that opens an inlet of a heating furnace during a working beam operation in which a work placed on the entry end of a heating furnace is transferred into the heating furnace by repeatedly raising, advancing, lowering, and backing the working beam ,
Wherein the loading door is opened by reducing the amount of opening of the loading door when the material is not present in the loading /
A distance value obtained by adding a forward distance value of the working beam to a charging distance value obtained by summing a forward distance of the pusher and a width of the workpiece for moving the workpiece to the long- And judging that the material is not present at the long-mouth end if the summed distance value is less than the preset value. delete The method according to claim 1,
Wherein the opening amount of the loading door when the material is absent at the entry end is a value corresponding to a height at which the door will not collide with the loading door when the working beam rises and advances. A method for operating a loading door that opens an inlet of a heating furnace during a working beam operation in which a work placed on the entry end of a heating furnace is transferred into the heating furnace by repeatedly raising, advancing, lowering, and backing the working beam ,
The pusher is advanced to load the material into the long-mouth end of the heating furnace,
The loading door is fully opened when the working beam rises,
Wherein when the material is not present at the entry end of the heating furnace, the opening amount of the fully opened loading door is reduced,
Comparing the forward distance value of the working beam with a charging distance value obtained by summing the forward distance of the pusher and the width of the workpiece, and comparing the summed distance value with a predetermined value, And judging that there is no material at the entry end of the heating furnace if it is smaller than the predetermined value. delete
KR1020160175457A 2016-12-21 2016-12-21 Method of operating charge door of furnace KR101864884B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112899465A (en) * 2021-01-20 2021-06-04 武安市裕华钢铁有限公司 Method for reducing oxidation of plate blank discharged from furnace
KR20220053280A (en) 2020-10-22 2022-04-29 주식회사 포스코 Apparatus for introducing material to charge in heat treatment furnace

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120057987A (en) * 2010-11-29 2012-06-07 현대제철 주식회사 Heating furnace and control method thereof
KR20140026081A (en) * 2012-08-24 2014-03-05 주식회사 포스코 Heating apparatus and heating method for slab
KR20160023133A (en) 2014-08-21 2016-03-03 주식회사 포스코 Apparatus for controling door of furnace
KR20160072970A (en) * 2014-12-16 2016-06-24 주식회사 포스코 Furnace for heating slab and control method for charging slab in heating furnace

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120057987A (en) * 2010-11-29 2012-06-07 현대제철 주식회사 Heating furnace and control method thereof
KR20140026081A (en) * 2012-08-24 2014-03-05 주식회사 포스코 Heating apparatus and heating method for slab
KR20160023133A (en) 2014-08-21 2016-03-03 주식회사 포스코 Apparatus for controling door of furnace
KR20160072970A (en) * 2014-12-16 2016-06-24 주식회사 포스코 Furnace for heating slab and control method for charging slab in heating furnace

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220053280A (en) 2020-10-22 2022-04-29 주식회사 포스코 Apparatus for introducing material to charge in heat treatment furnace
CN112899465A (en) * 2021-01-20 2021-06-04 武安市裕华钢铁有限公司 Method for reducing oxidation of plate blank discharged from furnace

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